Nay for the system reset. Just leave it but by all means critically observe karma messages.
If anything, I think the 12 hour

karma per person is too long. I've asked questions and have received genuine help from the same person but was unable to further thank them =(
And instead of having the 1 karma per person each 12 hours, a member could get a limit on how much karma they can give or take. Say, 5 karma to use by each member per 24 hours. So, I can give person A +2 karma for helping me out,+1 to person B for helping me and -1 to person C in 24 hours. Of course, if anyone decides to -5 karma to a single person everyday, the mods will take action.
Oh and maybe disable +/- karma in PMs.
I have no problems with raising the post count for karma giving/taking.